netdev - Re: mac80211: avoid allocating TXQs that won't be used

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Date:   Wed, 20 Sep 2017 19:51:44 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Colin Ian King <colin.king@...onical.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: mac80211: avoid allocating TXQs that won't be used

On Wed, 2017-09-20 at 17:08 +0100, Colin Ian King wrote:
> Johannes,
> 
> Static analysis with CoverityScan on linux-next today detected a null
> pointer dereference issue on commit:
> 
> From 0fc4b3403d215ecd3c05505ec1f0028a227ed319 Mon Sep 17 00:00:00
> 2001
> From: Johannes Berg <johannes.berg@...el.com>
> Date: Thu, 22 Jun 2017 12:20:29 +0200
> Subject: [PATCH] mac80211: avoid allocating TXQs that won't be used
> 
> Issue: sdata is null when the sdata is dereferenced by:
> 
>                    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
>                    sdata->vif.type != NL80211_IFTYPE_MONITOR)
> 
> note that sdata is assigned a non-null much later with the statement
> sdata = netdev_priv(ndev).

Yeah, umm, that should be checking just 'type'. Thanks, will fix.

johannes